// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/win/iunknown_impl.h"

#include "base/win/scoped_com_initializer.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace base {
namespace win {

    class TestIUnknownImplSubclass : public IUnknownImpl {
    public:
        TestIUnknownImplSubclass()
        {
            ++instance_count;
        }
        ~TestIUnknownImplSubclass() override { --instance_count; }
        static int instance_count;
    };

    // static
    int TestIUnknownImplSubclass::instance_count = 0;

    TEST(IUnknownImplTest, IUnknownImpl)
    {
        ScopedCOMInitializer com_initializer;

        EXPECT_EQ(0, TestIUnknownImplSubclass::instance_count);
        IUnknown* u = new TestIUnknownImplSubclass();

        EXPECT_EQ(1, TestIUnknownImplSubclass::instance_count);

        EXPECT_EQ(1u, u->AddRef());
        EXPECT_EQ(1u, u->AddRef());

        IUnknown* other = NULL;
        EXPECT_EQ(E_NOINTERFACE, u->QueryInterface(IID_IDispatch, reinterpret_cast<void**>(&other)));
        EXPECT_EQ(S_OK, u->QueryInterface(IID_IUnknown, reinterpret_cast<void**>(&other)));
        other->Release();

        EXPECT_EQ(1u, u->Release());
        EXPECT_EQ(0u, u->Release());
        EXPECT_EQ(0, TestIUnknownImplSubclass::instance_count);
    }

} // namespace win
} // namespace base
